/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.optimizer.sharding.result;

import com.alibaba.polardbx.optimizer.sharding.label.Label;
import com.alibaba.polardbx.optimizer.sharding.utils.ExtractorContext;
import org.apache.calcite.plan.RelOptTable;

import java.util.Optional;

/**
 * @author chenmo.cm
 */
public class NormalConditionResultSet extends EmptyConditionResultSet {

    private final ExtractionResult result;
    private final RelOptTable table;
    private final ExtractorContext context;

    protected NormalConditionResultSet(ExtractionResult result, RelOptTable table) {
        this.result = result;
        this.table = table;
        this.context = Optional.ofNullable(result).map(ExtractionResult::getContext).orElse(null);
    }

    @Override
    public ConditionResult intersect() {
        return ResultFactory.normalConditionOf(context, result.getIntersectResultBean(), table);
    }

    @Override
    public ConditionResult first() {
        if (!result.getTableLabelMap().containsKey(table)) {
            return EmptyConditionResult.EMPTY;
        }

        final Label label = result.getTableLabelMap().get(table).entrySet().iterator().next().getValue();
        return ResultFactory.pushdownConditionIn(context, label);
    }

}
